This mausoleum is from the period of the Eretnalı (and from the 14th century (I found in the 1350's) in the classical Seljuk style. Under the dome are the last two verses of the Bakara (The cow, chapter in Quran) hewn in stone.
Ad Eretnalı: Eretnids (Turkish plural; Eretnaoğulları) was an Anatolian beylik that succeeded the Ilkhanid governors in Anatolia and that ruled in a large region extending between Caesarea (Kayseri), Sebastea (Sivas) and Amaseia (Amasya) in Central Anatolia between 1328 and 1381.

It is at some twohundred metres from the Forum shopping mall.